Finland-Estonia undersea rail tunnel investigated

€13 billion rail tunnel would link Helsinki and Tallinn
Finland and Estonia have agreed to fully examine a proposed €13 billion undersea rail tunnel connecting their capitals.
The tunnel would connect Helsinki and Tallinn using land transport, in addition to the existing fast-ferry and air links. Talllinn remains extremely popular among Finnish tourists, while tens of thousands of Estonians commute to the Helsinki area for work.
A tunnel would cut travel times from the current 90 minutes by fast ferry to about 30 minutes by rail.
The project has been under discussion for many years as an extension of plans to build a Rail Baltica high-speed rail link between Tallinn and the Polish capital Warsaw via Estonia, Latvia and Lithuania by 2025.BBC